My Inquiry
My Account
Texas Instruments SN74HC574APWR
- Part No.:
- SN74HC574APWR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74HC574APWR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,468
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SN74HC574APWR from Texas Instruments is an octal edge-triggered D-type flip-flop with 3-state outputs, designed for bus driving in digital systems. It operates across 2 V to 6 V, delivers ±6 mA output drive at 5 V, exhibits typical propagation delay of 22 ns (VCC = 4.5 V, CL = 50 pF), and supports clock frequencies up to 24 MHz. It is used in I/O port expansion and bidirectional data bus buffering in industrial controllers and embedded peripherals.
For engineers reviewing the SN74HC574APWR datasheet, SN74HC574APWR pinout, SN74HC574APWR application, or SN74HC574APWR equivalent, key selection criteria include its 3-state bus-compatible output architecture, wide supply voltage range, low ICC (80 µA max), precise setup/hold timing (tsu = 25 ns, th = 5 ns at 4.5 V), and TSSOP-20 package compatibility with high-density PCB layouts.
Technical Context
The SN74HC574APWR implements eight independent D-type latches triggered on the rising edge of CLK, with synchronous data capture and asynchronous 3-state control via OE. Its output-enable logic is noninverting and does not affect internal flip-flop state retention - data can be updated while outputs remain high-impedance.
It features bus-structured pinout for minimized trace crosstalk, CMOS-level input thresholds (VIH = 3.15 V, VIL = 1.35 V at VCC = 4.5 V), and robust noise immunity with ±1 µA max input current. Thermal performance is characterized by RθJA = 131.8 °C/W in its TSSOP-20 package, supporting operation from –40 °C to +85 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 6 V - enables direct interface with 3.3 V and 5 V logic domains without level shifters. |
| Propagation Delay (tpd) | 22 ns typical at VCC = 4.5 V, CL = 50 pF - ensures timing compliance in 24 MHz bus clocking applications. |
| Output Drive Strength | ±6 mA at VCC = 5 V - directly drives 15 LSTTL loads or standard CMOS buses without external buffers. |
| Input Leakage Current | ±1 µA max - minimizes static power draw and prevents floating-input-induced instability. |
| Setup/Hold Time | tsu = 25 ns, th = 5 ns at VCC = 4.5 V - defines minimum data stability window before/after CLK rising edge for reliable capture. |
| Quiescent Current (ICC) | 80 µA max at VCC = 6 V - supports low-power system states without compromising register functionality. |
| 3-State Enable/Disable Time | ten = 32 ns, tdis = 32 ns at VCC = 4.5 V - enables fast bus arbitration and multi-master contention resolution. |
Pinout & Package
TSSOP-20 package (PW), 6.50 mm × 4.40 mm body size, 1.2 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CLK) | Clock Input | Rising-edge trigger for synchronous data capture into all eight flip-flops. |
| 2–9 (D1–D8) | Data Inputs | Parallel 8-bit data path; sampled on CLK↑ and held until next clock edge. |
| 11–18 (Q1–Q8) | 3-State Outputs | Bus-compatible outputs; high-impedance when OE = high, otherwise driven high/low per stored data. |
| 19 (OE) | Output Enable | Active-low control (logic low enables outputs); asynchronous and noninverting relative to output state. |
| 10 (GND) | Ground Reference | Primary return path for all signals and power; must be low-impedance for noise immunity. |
| 20 (VCC) | Power Supply | Single-supply rail (2–6 V); requires local 0.1 µF bypass capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Wide-Voltage Operation | 2 V to 6 V supply range allows interoperability across legacy 5 V and modern 3.3 V systems without voltage translation. |
| High-Current 3-State Outputs | ±6 mA drive at 5 V supports direct connection to loaded data buses, eliminating need for discrete bus buffers. |
| Low-Power CMOS Architecture | 80 µA max ICC enables use in battery-backed registers and always-on subsystems with minimal standby consumption. |
| Bus-Structured Pinout | D and Q pins arranged in parallel order (D1–D8 left, Q1–Q8 right) simplifies PCB routing and reduces signal skew on shared buses. |
| Robust Timing Margins | 25 ns setup time and 5 ns hold time at 4.5 V provide margin for jitter-prone clock sources in industrial environments. |
Applications
| Industrial PLC I/O Expansion | Embedded Microcontroller Bus Interface |
|---|---|
Use Scenario: Adding parallel digital input/output capability to a programmable logic controller using a microcontroller with limited GPIO. IC Role / Device Role / Timing Role: Acts as an 8-bit output latch and input buffer, isolating the MCU from field-side transients while synchronizing data transfers to the main bus clock. Use Value: Enables deterministic read/write timing via CLK edge-triggering and eliminates bus contention using OE-controlled 3-state outputs during data transfer handshaking. |
Use Scenario: Interfacing an ARM Cortex-M4 microcontroller to an external SRAM or peripheral ASIC requiring strict address/data bus timing. IC Role / Device Role / Timing Role: Buffers and latches address or data lines to meet setup/hold requirements of slower memory devices while decoupling from MCU clock domain. Use Value: Provides 22 ns typical tpd and 24 MHz max clock rate - sufficient to bridge timing gaps between high-speed MCUs and legacy parallel memories. |
| Test Equipment Digital Pattern Generator | Automotive Body Control Module |
Use Scenario: Generating synchronized 8-bit stimulus patterns for functional testing of digital ICs on ATE platforms. IC Role / Device Role / Timing Role: Stores and outputs stable test vectors under precise CLK control; OE enables pattern sequencing without bus glitches. Use Value: ±6 mA drive strength ensures clean signal edges into 50 Ω loads, and low ICC supports long-duration automated test sequences without thermal derating. |
Use Scenario: Managing door lock actuator status feedback and window motor control signals in a centralized BCM. IC Role / Device Role / Timing Role: Latches sensor inputs (e.g., door open/closed) and drives relay control lines with glitch-free 3-state isolation during mode transitions. Use Value: Wide 2–6 V operation tolerates automotive battery fluctuations (e.g., cold-crank dips to 2.5 V), and –40 °C to +85 °C rating meets AEC-Q100 ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574PW | CMOS input thresholds replaced with TTL-compatible VIH/VIL (2 V min / 0.8 V max at VCC = 5 V); identical pinout and timing. | Better suited for mixed 5 V TTL/CMOS systems where legacy logic drives the D inputs. | Select SN74HCT574PW when interfacing directly to 74LS-series outputs without level shifting. |
| 74LCX574MTCX | Lower VCC range (2.0–3.6 V), higher speed (tpd = 6.5 ns typ at 3.3 V), and enhanced ESD protection (±2 kV HBM). | Optimized for 3.3 V-only portable and low-voltage industrial designs requiring faster throughput. | Choose 74LCX574MTCX for new 3.3 V designs prioritizing speed and ESD robustness over 5 V compatibility. |
Compared with SN74HC574APWR, SN74HCT574PW offers TTL input compatibility at 5 V but sacrifices universal 2–6 V flexibility, while 74LCX574MTCX delivers superior speed and ESD tolerance in 3.3 V systems but cannot operate above 3.6 V - making SN74HC574APWR the optimal general-purpose choice for mixed-voltage bus interfaces.
Availability
SN74HC574APWR is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, embedded microcontroller bus interfacing, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SN74HC574APWR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of experience in high-reliability industrial and automotive-grade components.
The SN74HC574APWR belongs to TI's HC logic family, engineered for robust performance in noise-sensitive digital systems requiring precise timing, wide supply tolerance, and bus-friendly 3-state outputs.
FAQ
What is the maximum clock frequency supported by SN74HC574APWR?
The SN74HC574APWR supports a maximum clock frequency of 24 MHz at VCC = 4.5 V and TA = 25 °C (CL = 50 pF). At 6 V, fmax rises to 28 MHz under the same conditions. These values assume proper layout, bypassing, and load capacitance - exceeding them may cause metastability or timing violations in the SN74HC574APWR.
Does SN74HC574APWR require external pull-up resistors on its outputs?
No, SN74HC574APWR does not require external pull-up resistors on its outputs. Its 3-state outputs are actively driven high or low when enabled (OE = low), and present high impedance (not floating) when disabled (OE = high). Pull-ups are unnecessary unless a specific bus protocol mandates weak default states - which is not required for standard SN74HC574APWR operation.
Can SN74HC574APWR operate reliably at 2.5 V supply voltage?
Yes, SN74HC574APWR is fully specified down to 2 V supply voltage. At 2.5 V, it maintains guaranteed functionality with VIH = 1.7 V min, VIL = 0.7 V max, tpd ≤ 270 ns, and tsu ≥ 125 ns - meeting requirements for low-voltage industrial sensors and battery-powered subsystems where SN74HC574APWR serves as a voltage-scalable interface register.
What is the thermal resistance (RθJA) of SN74HC574APWR in its TSSOP package?
The junction-to-ambient thermal resistance (RθJA) of SN74HC574APWR in the TSSOP-20 (PW) package is 131.8 °C/W, per TI's SCLS148H datasheet revision May 2022. This value assumes standard JEDEC 2-layer board conditions; actual thermal performance improves with PCB copper pour and thermal vias beneath the exposed pad region of the SN74HC574APWR.
How does the OE pin function in SN74HC574APWR, and is it synchronous or asynchronous?
The OE (output enable) pin in SN74HC574APWR is asynchronous and active-low. When OE = low, outputs Q1–Q8 reflect the stored D-input states; when OE = high, all outputs enter high-impedance regardless of CLK or D activity. OE does not affect internal flip-flop operation - data can be latched or retained independently of output state, a key feature of the SN74HC574APWR architecture.
SN74HC574APWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 84 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 6V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74HC574APWR FAQ
1.How can I place an order for SN74HC574APWR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74HC574APWR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74HC574APWR reliable?
The price and inventory of SN74HC574APWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74HC574APWR is usually 5 days.
3.What payment methods are accepted for SN74HC574APWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74HC574APWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74HC574APWR?
SN74HC574APWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74HC574APWR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74HC574APWR?
For technical support, including SN74HC574APWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74HC574APWR requirements.
6.How does Aetrix verify that SN74HC574APWR is sourced from the original manufacturer or authorized distributors?
All SN74HC574APWR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74HC574APWR meets industry standards.
7.What is the process for return or replacement of SN74HC574APWR?
All SN74HC574APWR units undergo pre-shipment inspection (PSI). If there is an issue with SN74HC574APWR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74HC574APWR part is unused and in its original packaging.
Return procedure for SN74HC574APWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SN74HC574APWR Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
